在小学数学教材中,没给出找循环小数循环节的具体方法,人们往往是根据循环小数的意义,从小数部分第一位起,去逐步查找循环节的。这样作的弊端是,遇有0.00707……一类的循环小数,学生容易将其很不妥当地简写为0.0070。为解决这一问题,我在教学中采用“倒找”的方法,如 0.0070707……根据箭头指示的方向,从右往左倒过来来分析、寻 In primary school mathematics textbooks, did not give the specific method of looking for the cycle of decimal fraction, people are often based on the meaning of circular fraction, from the decimal part of the first, to gradually find the cycle section. The downside to doing this is that in the case of a recurring fraction of 0.00707 ..., it is easy for students to abbreviate it as 0.0070 improperly. In order to solve this problem, I used the method of “find the wrong” in teaching, such as 0.0070707 ...... According to the direction of the arrow, from right to left, come back to analyze, find